package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.UserHolder;
import org.springframework.aop.framework.AopContext;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucherService;

    @Resource
    private RedisIdWorker redisIdWorker;
    @Override
    public Result seckillVoucher(Long voucherId) {
         //1.查询优惠券
        SeckillVoucher voucher= seckillVoucherService.getById(voucherId);
        //2/判断秒速是否开始
        if(voucher.getBeginTime().isAfter(LocalDateTime.now())){
            return Result.fail("秒速尚未开始");
        }
        //3.判断秒速是否结束
        if(voucher.getEndTime().isBefore(LocalDateTime.now())){
            return Result.fail("秒速已结束");
        }
        //4.判断库存是否充足
        if(voucher.getStock() < 1){
            return Result.fail("库存不足");
        }

        Long userId= UserHolder.getUser().getId();
        synchronized (userId.toString().intern()) {
            //获取代理对象
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);
        }
    }

    @Transactional
    public Result createVoucherOrder(Long voucherId) {
        //5. 一人一单
        Long userId= UserHolder.getUser().getId();
        //5.1 查询订单
        int count = query().eq("user_id",userId).eq("voucher_id", voucherId).count();
        //5.2 判断是否存在
        if(count > 0){
            return Result.fail("只能购买一次");
        }

        //6.扣减库存
        boolean success=seckillVoucherService.update()
                .setSql("stock = stock - 1").//set stock=stock - 1
                        eq("voucher_id", voucherId).gt("stock",0)//where id=? and stock > 0
                .update();
        if(!success){
            //扣减失败
            return Result.fail("库存不足");
        }

        //7.创建订单
        VoucherOrder voucherOrder=new VoucherOrder();
        //订单id
        long orderId=redisIdWorker.nextId("order");
        voucherOrder.setId(orderId);
        //用户id
        voucherOrder.setUserId(userId);
        //代金券id
        voucherOrder.setVoucherId(voucherId);
        save(voucherOrder);

        //8.返回订单id
        return Result.ok(orderId);
    }
}
